Statistics about polar bears, a threatened species

FILE - In this undated file photo provided by The Toledo Zoo, baby polar bear cubs Suka and Sakari, born in November, 2012, are seen at the zoo in Toledo, Ohio. The Toledo Zoo produced two of the only three cubs that were born in U.S. zoos last year. Zoos around the country will soon find out whether a beagle named Elvis can let them know when their polar bears are pregnant. The 2-year-old has been specially trained for a year by a Kansas handler to sniff fecal samples to identified proteins present only in pregnant bears' samples. (AP Photo/The Toledo Zoo, File)

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The advocacy organization Polar Bears International celebrates Nov. 4-10 as "Polar Bear Week." Some statistics about the threatened species: